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  Video display apparatus and methodUSPTO Application #: 20070222703Title: Video display apparatus and method Abstract: A video display apparatus displays videos corresponding to a plurality of observers respectively and comprises a display device. A control unit controls a scan timing so that a sum of a video scanning period from an upper end to a lower end of the display device concerning one video input into the display device and a response period in the lower end of the display device is smaller than a field period of the video. The control unit allows an illumination system to emit light between the end of the response period of the lower end and the start of scanning of the next video in the upper end of the display device. (end of abstract) Agent: Frishauf, Holtz, Goodman & Chick, PC - New York, NY, US Inventors: Ryohei Sugihara, Yoichi Iba USPTO Applicaton #: 20070222703 - Class: 345 4 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070222703. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2006-080093, filed Mar. 23, 2006, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002]1. Field of the Invention [0003]The present invention relates to a video display apparatus and a video display method capable of simultaneously observing videos which are different according to viewing directions. [0004]2. Description of the Related Art [0005]There has heretofore been known a liquid crystal display apparatus (hereinafter referred to as an MVD) by which it is possible to simultaneously observe videos which are different according to viewing direction. In the MVD, illuminative backlights having directivities in two different directions are alternately switched in synchronization with a time when different videos are alternately displayed in a time sharing manner in the liquid crystal display apparatus. Such a constitution is disclosed in, for example, Jpn. Pat. Appln. KOKAI Publication No. 2006-10935. [0006]FIG. 19 shows the behavior of driving the MVD by normal scanning. First, a video of a right field (hereinafter referred to as the right video) is scanned from an upper end of a screen based on a vertical synchronous signal in scan timing 1, scanned in the center of the screen in scan timing 2, and scanned in a lower end of the screen in scan timing 3, successively. After the video has been scanned in the lower end of the screen, a video (hereinafter referred to as the left video) of a left field is then scanned from the upper end of the screen. [0007]Graphs of displayed images (1 to 3) show behaviors in which the right video and the left video are alternately displayed in the upper end, the center and the lower end of the screen. [0008]Moreover, an example of image quality improvement of a dynamic video is disclosed in Jpn. Pat. Appln. KOKAI Publication No. 2001-183622. A technology concerning the image quality improvement in liquid crystal display of a field sequential driving system is disclosed in Jpn. Pat. Appln. KOKAI Publication No. 2003-215535. BRIEF SUMMARY OF THE INVENTION [0009]A first aspect of the present invention is directed to a video display apparatus capable of displaying videos corresponding to a plurality of observers, respectively, the apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, wherein the control unit controls a scan timing so that a sum of a video scanning period from an upper end to a lower end of the display device concerning one video input into the display device and a response period in the lower end of the display device is smaller than a field period of the video; and the control unit allows the illumination system to emit light between the end of the response period of the lower end and the start of scanning of the next video in the upper end of the display device. [0010]A second aspect of the present invention is directed to a video display apparatus capable of displaying videos corresponding to a plurality of observers, respectively, the apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, wherein the control unit inserts, between one video and the next video to be input into the display device, a reset signal to reset the one video; the control unit allows the illumination system to start light emission at the earliest timing that is a timing when a transmittance of a lower end of the display device is brought into a shield state in response to the reset signal from a state where the lower end of the display device displays one video; and the control unit allows the illumination system to stop the light emission at the latest timing that is a timing when display of the next video is started in an upper end of the display device. [0011]A third aspect of the present invention is directed to the video display apparatus according to the second aspect, wherein the control unit allows the illumination system to start the light emission at a timing when the display of the next video is started after the transmittance of the lower end of the display device has been brought into the shield state; and the control unit allows the illumination system to stop the light emission at a timing when a transmittance of the upper end of the display device is brought into a shield state in response to the reset signal from a state where the upper end of the display device displays the next video. [0012]A fourth aspect of the present invention is directed to the video display apparatus according to the second or third aspect, wherein the control unit sets the timings of the start and the stop of the light emission of the illumination system between the timing when the transmittance is brought into the shield state and the timing when the display of the next video is started so that quantities of lights to be transmitted through the upper end and the lower end of the display device in one scan with respect to the same signal are substantially equal to each other. [0013]A fifth aspect of the present invention is directed to a video display apparatus capable of displaying videos corresponding to a plurality of observers, respectively, the apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, wherein the control unit inserts, between one video and the next video to be input into the display device, a reset signal to reset the one video; the control unit allows the illumination system to start light emission between a time when a transmittance of the display device is brought into a shield state in response to the reset signal from a state where the lower end of the display device displays one video and a time when display of the next video is started in the lower end of the display device; and the control unit allows the illumination system to stop the light emission between the time when the transmittance of the display device is brought into the shield state in response to the reset signal from a state where an upper end of the display device displays the next video and a time when display of the further next video is started in the upper end of the display device. [0014]A sixth aspect of the present invention is directed to a video display method which displays videos corresponding to a plurality of observers, respectively, by use of a video display apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, the method comprising the steps of: controlling a scan timing so that a sum of a video scanning period from an upper end to a lower end of the display device concerning one video input into the display device and a response period in the lower end of the display device is smaller than a field period of the video; and allowing the illumination system to start light emission between the end of the response period of the lower end and the start of scanning of the next video in the upper end of the display device. [0015]A seventh aspect of the present invention is directed to a video display method which displays videos corresponding to a plurality of observers, respectively, by use of a video display apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, the method comprising the steps of: inserting, between one video and the next video to be input into the display device, a reset signal to reset the one video; allowing the illumination system to start light emission at the earliest timing that is a timing when a transmittance of a lower end of the display device is brought into a shield state in response to the reset signal from a state where the lower end of the display device displays one video; and allowing the illumination system to stop the light emission at the latest timing that is a timing when display of the next video is started in an upper end of the display device. [0016]An eighth aspect of the present invention is directed to the video display method according to the seventh aspect, further comprising the steps of: allowing the illumination system to start the light emission at a timing when the display of the next video is started after the transmittance of the lower end of the display device has been brought into the shield state; and allowing the illumination system to stop the light emission at a timing when a transmittance of the upper end of the display device is brought into a shield state in response to the reset signal from a state where the upper end of the display device displays the next video. [0017]A ninth aspect of the present invention is directed to the video display method according to the seventh or eighth aspect, wherein the control unit sets the timings of the start and the stop of the light emission of the illumination system between the timing when the transmittance is brought into the shield state and the timing when the display of the next video is started so that quantities of lights to be transmitted through the upper end and the lower end of the display device in one scan with respect to the same signal are substantially equal to each other. [0018]A tenth aspect of the present invention is directed to a video display method which displays videos corresponding to a plurality of observers, respectively, by use of a video display apparatus comprising a display device; a display device driving circuit which drives the display device; an illumination system which switches an illuminating direction of the display device; and a control unit which controls the display device driving circuit to alternately input different videos into the display device and which switches the illuminating direction of the illumination system in synchronization with the input of each video to thereby display in the display device the different videos in a time sharing manner, the method comprising the steps of: inserting, between one video and the next video to be input into the display device, a reset signal to reset the one video; allowing the illumination system to start light emission between a time when a transmittance of the display device is brought into a shield state in response to the reset signal from a state where the lower end of the display device displays one video and a time when display of the next video is started in the lower end of the display device; and allowing the illumination system to stop the light emission between the time when the transmittance of the display device is brought into the shield state in response to the reset signal from a state where an upper end of the display device displays the next video and a time when display of the further next video is started in the upper end of the display device. [0019]Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING [0020]The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. Continue reading... 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